HP Matrix Operating Environment Software - Manual (Page 112)

Insufficient resources on the VM host:
Smart Solver informs you when the destination VM host has insufficient resources to host all of
the consolidated systems. This can happen when the selected systems do not have enough
resource capacity to place all of the workloads or when workloads cannot be placed on any of
the selected systems. The Smart Solver will try to place as many workloads as will fit, giving you
a partial solution. When this occurs, you can click Return to Step 1 to adjust the attributes and
constraints for the VM host, or Cancel and return to the scenario editor. From there, adjust the
resources on your destination VM host or add another VM host to the automated consolidation
simulation. For more information on this behavior, see
“When available systems lack sufficient
capacity” (page 180) .
Results: Automated consolidation to VMs
Expected results
The solutions show the systems converted to VM guests on VM hosts. These VM hosts are either
existing VM hosts, “what-if” generated template VM hosts, or a combination, depending on
what destinations you selected. When a combination of VM hosts are chosen, the placement of
VM guests goes first to existing VM hosts, and then to the template VM hosts.
Further, as part of the input parameters, you can select to load balance the resulting VM hosts.
This load balancing occurs after and only amongst the target VM hosts that are required for the
consolidation solution. In other words, if the consolidation solution results in any VM hosts being
unused (and therefore, not required in the solution), the unused systems will not be involved in
the load balancing. Only the required systems in the solution are involved in the load balancing.
The resulting solution is the configuration requiring the fewest number of systems with the
minimal requirement for
headroom , while taking into consideration resource utilization and
utilization limits.
Resources The placement of VM guests takes into consideration CPU, memory, network I/O,
and disk I/O capacity, and utilization limits. If load balancing (balancing resource utilization
across the resulting systems) was selected, the VM guests were load balanced across the systems
that had 1 or more VM guests.
Resource capacity. Workloads that specify utilization limits for a metric (for example, memory
or disk I/O) can only be placed on resources that define a capacity for the corresponding metric.
In other words, if you specified that a workload never exceed 100% memory utilization, that
workload can only be placed on a system for which total memory capacity is known.
Utilization limits. Every workload selected must have at least one utilization limit applied before
using the Smart Solver. This can be any type of utilization limit, including the default global
utilization limit.
Headroom rating The headroom ranking shows the amount of available resource above the
existing resource utilization that will exist for the resulting solution in the simulation. Among
the solutions that require the same target systems, the solution with the tightest fit is shown.
Possible anomalies in the results
Fewer systems shown. The Smart Solver solution can contain fewer VM host targets than were
originally selected. This occurs when the workloads fit on fewer systems than originally selected.
For example, if systems A, B, and C are selected as target VM hosts, but all the workloads can
fit into VM hosts A and B, then only VM hosts A and B are shown in the solution.
Systems involved in load balancing. When load balancing is performed, the loads are balanced
only across the resulting systems in the solution. For example, if only VM hosts A and B are used
(and VM host C is not), then load balancing is performed only across VM hosts A and B. VM
host C is not included for the load balancing calculation.
112 Procedures